33 lines
842 B
Go
33 lines
842 B
Go
package register
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import (
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"git.akyoto.dev/cli/q/src/asm"
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"git.akyoto.dev/cli/q/src/cpu"
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"git.akyoto.dev/cli/q/src/sizeof"
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)
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func (f *Machine) RegisterNumber(mnemonic asm.Mnemonic, a cpu.Register, b int) {
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// The `MOVE` operation is very flexible and works with any type of immediate number.
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if mnemonic == asm.MOVE {
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f.Assembler.RegisterNumber(mnemonic, a, b)
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f.UseRegister(a)
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f.postInstruction()
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return
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}
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// If the number only needs 32 bits, we can encode the instruction.
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if sizeof.Signed(b) <= 4 {
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f.Assembler.RegisterNumber(mnemonic, a, b)
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f.postInstruction()
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return
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}
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// If the number needs 64 bits, we need to use a temporary register.
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tmp := f.NewRegister()
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f.Assembler.RegisterNumber(asm.MOVE, tmp, b)
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f.UseRegister(tmp)
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f.postInstruction()
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f.RegisterRegister(mnemonic, a, tmp)
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f.FreeRegister(tmp)
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}
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